It's genuinely shocking that LimeSurvey STILL has these ancient manuals available!
The manual is a wiki, feel free to help out by updating the manuals. However, in this specific case you shouldn't update anything. The assessment rules are a Limesurvey feature and they CAN be used. I personally wouldn't, as there are better and more flexible options to do the same or actually a lot better. This is what Joffm is trying to tell you.
They are a lot more limited and often require more work than doing the same with equations and expression manager/script. Features like assessment rules or condition designer are still there because people still use them and for some limited use cases they might actually work. And you know how things go: if you get rid of a feature, even if there is a better option, people will complain. A lot. So they are there. They probably will stay forever. I (and Joffm) do not recommend to use them anymore.They are considered "outdated" by many power users, because Limesurvey now has far more flexible and powerful solutions for this to offer (Expressions).
For complicated assessments the assessment feature really isn't a good choice, it doesn't allow you to do more complicated calculations.
Now regarding your issue:
You should really have a look at the manual pages about Expression Manager/Script. I am sure this will change your "life" in terms of Limesurvey. It won't take you much more than 30-60 mins to get a gist of the basics and you will understand how it works. Especially have a look at the examples that come with it. For more complicated approaches you can always go back to the manual later. Or of course ask here in the forum.
Here in the forum we can help you with specific questions, but we really can't teach the basics over and over again. From what I see through your postings you are getting out of the terrain of simple questionnaires into more advanced terrain. You will have to know the basics about expression manager and how to use equations, it will really speed up your processes, I am sure. Once you get an idea of what Expression Manager and Equations can do, you will see a lot of new opportunities.
It is important to have the basic concepts right, then all this will be easy. I know that expression manager can be overwhelming at the beginning, but it actually isn't all that complicated. It is not much different to using formulas or linking results from different cells in Excel.
So here a very general summary: usually you calculate your stuff in equation type questions (which you might want to hide via the GUI AFTER thorough testing, so that respondents don't see them).
To display the results of the calculations that you made, you can show them just like you can show the answers given to any other question by showing them in question texts, answer options, subquestion texts, text display questions, basically anywhere in Limesurvey where you can show some text.
You do this with something like this:
Code:
{CODEOFTHEEQUATIONQUESTION}
You can use "always hide this question" from the GUI in this case, it will still calculate everything just fine.
